package com.yicong.taxi.utils;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;

import java.util.Stack;

/**
 * activity 堆栈管理
 */

public class AppManagerUtil {

  private static Stack<Activity> activityStack;

  private volatile static AppManagerUtil instance;

  private AppManagerUtil() {

  }

  /**
   * 单一实例
   */
  public static AppManagerUtil getAppManager() {
    if (instance == null) {
      synchronized (AppManagerUtil.class) {
        if (instance == null) {
          instance = new AppManagerUtil();
          activityStack = new Stack();
        }
      }
    }
    return instance;
  }

  /**
   * 添加Activity到堆栈
   */
  public void addActivity(Activity activity) {
    if (activityStack == null) {
      activityStack = new Stack<Activity>();
    }
    activityStack.add(activity);
  }

  /**
   * 获取当前Activity（堆栈中最后一个压入的）
   */
  public Activity currentActivity() {
    try {
      Activity activity = activityStack.lastElement();
      return activity;
    } catch (Exception e) {
      //            e.printStackTrace();
      return null;
    }
  }

  /**
   * 获取当前Activity的前一个Activity
   */
  public Activity preActivity() {
    int index = activityStack.size() - 2;
    if (index < 0) {
      return null;
    }
    Activity activity = activityStack.get(index);
    return activity;
  }

  /**
   * 结束当前Activity（堆栈中最后一个压入的）
   */
  public void finishActivity() {
    Activity activity = activityStack.lastElement();
    finishActivity(activity);
  }

  /**
   * 结束指定的Activity
   */
  public void finishActivity(Activity activity) {
    if (activity != null) {
      activityStack.remove(activity);
      activity.finish();
      activity = null;
    }
  }

  /**
   * 移除指定的Activity
   */
  public void removeActivity(Activity activity) {
    if (activity != null) {
      activityStack.remove(activity);
      activity = null;
    }
  }

  /**
   * 结束指定类名的Activity
   */
  public void finishActivity(Class<?> cls) {
    try {
      for (Activity activity : activityStack) {
        if (activity.getClass().equals(cls)) {
          finishActivity(activity);
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * 结束所有Activity
   */
  public void finishAllActivity() {
    for (int i = 0, size = activityStack.size(); i < size; i++) {
      if (null != activityStack.get(i)) {
        activityStack.get(i).finish();
      }
    }
    activityStack.clear();
  }

  /**
   * 结束指定class 之外的所有Activity
   */
  public void finishAllActivityExcept(Class<?> cls) {
    if (activityStack != null) {
      for (int i = 0, size = activityStack.size(); i < size; i++) {
        if (cls == activityStack.peek().getClass()) {
        } else {
          finishActivity(activityStack.peek());
        }
      }
    }
  }

  /**
   * 返回到指定的activity
   */
  public void returnToActivity(Class<?> cls) {
    while (activityStack.size() != 0) {
      if (activityStack.peek().getClass() == cls) {
        break;
      } else {
        finishActivity(activityStack.peek());
      }
    }
  }

  /**
   * 是否已经打开指定的activity
   */
  public boolean isOpenActivity(Class<?> cls) {

    if (activityStack != null) {
      for (int i = 0, size = activityStack.size(); i < size; i++) {
        if (cls == activityStack.peek().getClass()) {
          return true;
        }
      }
    }
    return false;
  }

  public int activitySize() {
    if (activityStack != null) {
      return activityStack.size();
    } else {
      return 0;
    }
  }

  /**
   * 退出应用程序
   *
   * @param context 上下文
   * @param isBackground 是否开开启后台运行
   */
  public void AppExit(Context context, Boolean isBackground) {
    try {
      finishAllActivity();
      ActivityManager activityMgr = (ActivityManager) context
          .getSystemService(Context.ACTIVITY_SERVICE);
      activityMgr.restartPackage(context.getPackageName());
    } catch (Exception e) {

    } finally {
      // 注意，如果您有后台程序运行，请不要支持此句子
      if (!isBackground) {
        System.exit(0);
      }
    }
  }
}
